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The limit of electron transfer in electron affinity from the oxide surface to the electron acceptor (EA) are reported from the adsorption of EA on DY203' mixed oxides of DY203 with alumina and mixed oxides of Y203 with yalumina. The extent of electron transfer is understood from magnetic measurements. The adsorption of electron acceptors (EA) on metal oxides has be0n investigated to estimate electron donor properties of metal oxides and their characterizatioh [1]. The electron donor properties of some of the rare earth oxides have been reported [2-4 J. DY203 and Y203 have been used as catalyst for a variety of reactions l 5]. In this paper we report surface electron donating properties and magnetic properties of DY203 activated at various temperatures and its mixed oxides with alumina and mixed oxides of Y203 with y-alumina. EXPERIMENTAL DY203 and Y203 were obtained from Indian Rare Earths Ltd.